CN1414119A

CN1414119A - Method of producing common orientation silicon steel

Info

Publication number: CN1414119A
Application number: CN 02115784
Authority: CN
Inventors: 刘本仁; 邓崎琳; 应宏; 毛炯辉; 曹阳; 宋平; 杨华国; 曾健鸣; 柳志敏; 徐慧英; 张翔; 刘文仲; 付连春; 刘昆华; 黄煊官; 李国保; 喻承欢; 苏毅; 徐静波; 裴大荣
Original assignee: Wuhan Iron and Steel Group Corp
Current assignee: Wuhan Iron and Steel Group Corp
Priority date: 2002-04-28
Filing date: 2002-04-28
Publication date: 2003-04-30
Anticipated expiration: 2022-04-28
Also published as: CN1190506C

Abstract

A process for preparing ordinary orientated silicone steel includes such steps as heating raw silicone steel plate to higher than 1280 deg.C rolling to make its thickness become 1.5-3.0 mm, and cold rolling twice. It features that before intermediate decarbonizing and annealing, it is preheated to 450-700 deg.C, and the temp is holded for 20-200 seconds before it is heated to annealing temp. Its advantages are high magnetic performance, high productivity and low cost.

Description

A kind of method of producing common orientation silicon steel

One, technical field

The present invention relates to produce the method for steel plate, be particularly suited for producing the method for common orientation silicon steel plate.

Two, background technology

Usually, adopting at the sulfide with Mn, Cu is in the common orientation silicon steel production process of main inhibitor, in order to give full play to the effect of its inhibitor, obtains good magnetic, adopts: 1. improve hot rolling finishing temperature; 2. the back operation adopts the short period of time annealing (tandem process annealing TAL is as the method for the public clear 59-143022 of Japanese Patent spy) of adding about 1000 ℃ of left and right sides temperature after 800～900 ℃ of process annealings when process annealing; Simultaneously 3. improve interior thickness as far as possible, adopt methods such as the higher second time of cold rolling draft.After adopting these three kinds of methods, though can improve the magnetic property of finished product effectively, the deficiency of its existence:

(1) adopt to improve in the method for hot rolling finishing temperature, mainly contain two approach, promptly or improve the hot rolling Heating temperature, perhaps increase hot-rolled sheet thickness to reduce the temperature drop in the finish rolling process.As everyone knows, be the hot rolling Heating temperature that the oriented silicon steel of main inhibitor is had relatively high expectations with MnS, improve further that the hot rolling Heating temperature will make that energy consumption increases, lumber recovery reduces, the process furnace production cycle shortens.And improve hot-rolled sheet thickness, then make cold rolling difficulty for the first time, rolling pass be difficult to arrange, the production capacity when influence back operation is cold rolling.

When (2) adopting TAL annealing, on the process annealing production line, need special outfit High Temperature Furnaces Heating Apparatus section, thereby annealing furnace, furnace bottom roll are had higher requirement; And the raising interior thickness then makes process annealing output reduce, owing to adopted TAL annealing again, also makes easily to produce cold rolling difficulty for the second time broken belt, thereby influence the raising of lumber recovery and output.

Three, technology contents

The objective of the invention is to overcome above-mentioned deficiency, a kind of method of producing common orientation silicon steel that steel plate magnetic property height, production efficiency height, production cost are reduced is provided.

Its technical solution

Mainly comprise: blank plates of silicon steels is being heated under the temperature condition more than 1280 ℃; Blank plates of silicon steels after heating is rolled into the hot-rolled steel sheet of 1.50～3.0 mm thick; Back operation adopts twice cold-rolling practice to carry out routine and produces.For making steel plate magnetic property height, production efficiency height, be before silicon steel sheet is carried out centre decarburizing annealing, earlier steel plate is preheating to 450～700 ℃, in this temperature range, steel plate is incubated, its soaking time is 20～200 seconds, then steel plate is heated, make its reach in the middle of decarburizing annealing temperature required and carry out back operation production routinely.

Because in course of hot rolling, copper (Cu) is separated out with the form of sulfide with sulphur (S), inhibitors of primary grain growth when can be used as the oriented silicon steel secondary recrystallization, favourable to magnetic, but copper content is lower than 0.05% o'clock DeGrain, and copper content is higher than at 0.50% o'clock, not only make cost increase, also can make blank plates of silicon steels when hot rolling, be prone to crackle, and make and when pickling, have difficulties, so be limited to 0.05～0.50% (weight percent) for copper content requirement in the silicon steel sheet.

Be preheating to 450～700 ℃ mechanism situation about steel plate: show after deliberation, the oriented silicon steel hot-rolled sheet behind rolling deformation, have the Gauss position to deformed grains during in thermal treatment subsequently, its easiest generation answer and recrystallize.As everyone knows, the magnetic of oriented silicon steel depend on to a great extent have in the steel plate Gauss position to the quantity of crystal grain.Since the Gauss position to crystal grain have heredity, therefore, arbitrary operation during this time as make the Gauss position to the crystal grain increase all can make the magnetic of finished product good.And when oriented silicon steel hot-rolled sheet preheating temperature below 450 ℃ the time, have the Gauss position to deformed grains be difficult for taking place to reply and recrystallize.And when oriented silicon steel hot-rolled sheet preheating temperature more than 700 ℃ the time, though can grow up to crystal grain in the Gauss position, also grow up to crystal grain in other positions thereupon, can not significantly increase the component of Gauss position to crystal grain.In addition, because part copper can be separated out with copper-rich phase in 450～700 ℃ of scopes, play the effect that suppresses the primary recrystallization grain growth, therefore, in order to increase the steel meta to Gauss's crystal grain preferably, and suppress other effects of growing up simultaneously, so the steel plate preheating temperature is controlled in 450～700 ℃ of scopes to crystal grain.

About the soaking time problem: be lower than 20 seconds as soaking time, then because the too short DeGrain that makes of soaking time.When soaking time is longer than 200 seconds, energy consumption increase, cost are improved.

The invention has the advantages that common orientation silicon steel plate magnetic property height, production efficiency height, the production cost produced are reduced; When adopting TAL annealing, on the process annealing production line, do not need to be equipped with specially the High Temperature Furnaces Heating Apparatus section; Need not improve interior thickness, for the second time cold rollingly can not produce difficulty, be difficult for producing belt phenomenon because of the use of process annealing stove.

Four, specific embodiments

Embodiment one

To contain C is 0.042% (weight percent), Si is 3.2% (weight percent), Mn is that 0.061% (weight percent), Cu are the directional silicon steel slab of 0.174% (weight percent), be hot-rolled down to 2.22 mm thick, adopt cold-rolling practice then twice, be cold-rolled to 0.75 mm thick for the first time, subsequently steel plate is preheating to 490～550 ℃, and in this temperature range, be incubated 35～80 seconds, make steel plate be heated to 860 ℃ then and carry out centre decarburizing annealing; It is cold rolling to carry out the second time again, is rolled to 0.285 mm thick; After decarburizing annealing, high temperature annealing, stretching and leveling annealing and being coated with operation such as insulation layer, finished product detects through epstein frame, and its magnetic property sees Table one.Table one

Sample	Hot rolling thickness of slab (mm)	Preheating temperature ℃	Soaking time second	TAL annealing	Interior thickness (mm)	Electromagnetic performance
						Electromagnetic performance		????B8 ????(T)	??P17/50 ??(w/kg)
						Experiment 1 experiment 2 experiments 3 experiments 4 comparative examples 1 comparative example 2 comparative examples 3	????2.22 ????2.22 ????2.22 ????2.22 ????2.50 ????2.50 ????2.50	????B8 ????(T)	??P17/50 ??(w/kg)	490 510 530 550 × × ×	80 65 45 35 × × ×	× × × × √ √ √	????0.75 ????0.75 ????0.75 ????0.75 ????0.83 ????0.83 ????0.83	????1.859 ????1.855 ????1.853 ????1.863 ????1.861 ????1.855 ????1.847	????1.184 ????1.188 ????1.191 ????1.192 ????1.202 ????1.185 ????1.193

As seen from the above table, compare, adopt the present invention also to have good magnetic with methods such as adopting TAL.

Embodiment two

The directional silicon steel slab that will contain C and be 0.043% (weight percent), Si and be 3.2% (weight percent), Mn and be 0.056% (weight percent), Cu and be 0.079% (weight percent) is thick to 2.22mm through hot continuous rolling, be cold-rolled to for the first time 0.75 mm thick, subsequently steel plate is preheating to 550 ℃, and under this temperature, adopt different soaking times, make steel plate be heated to 860 ℃ then and carry out centre decarburizing annealing; It is cold rolling to carry out the second time again, is rolled to 0.285 mm thick; After decarburizing annealing, high temperature annealing, stretching and leveling annealing and being coated with operation such as insulation layer, finished product detects through epstein frame, and its magnetic property sees Table two.

Table two

Sample	During the low insulation of low insulation temperature (℃) between (second)	Magnetic
		Magnetic		????B ₈₀₀T	??P _17/50?w/kg
		Experiment 1 experiment 2 experiments 3 comparative examples 1 comparative example 2 comparative examples 3	550 20 550 40 550 50 directly heat up carries out process annealing	????B ₈₀₀T	??P _17/50?w/kg	????1.842 ????1.842 ????1.848 ????1.834 ????1.839 ????1.825	????1.123 ????1.124 ????1.122 ????1.243 ????1.234 ????1.269

Claims

1, a kind of method of producing common orientation silicon steel mainly comprises: blank plates of silicon steels is being heated under the temperature condition more than 1280 ℃; Blank plates of silicon steels after heating is rolled into the hot-rolled steel sheet of 1.50～3.0 mm thick; Back operation adopts twice cold-rolling practice to carry out routine and produces, it is characterized in that before silicon steel sheet is carried out centre decarburizing annealing, earlier steel plate is preheating to 450 ~ 700 ℃, in this temperature range, steel plate is incubated, its soaking time is 20 ~ 200 seconds, then steel plate is heated, make its reach in the middle of decarburizing annealing temperature required and carry out back operation production routinely.

2, a kind of method of producing common orientation silicon steel according to claim 1 is characterized in that this method is limited to 0.05～0.50% (weight percent) for the copper content requirement in the silicon steel sheet.